Hard to believe, but Jessica Simpson's first baby Maxwell is already 15 months old -- and based on a recent picture shared by Ms. Simpson, she's growing up fast!

Simpson, who hasn't posted on Twitter in over a month, captioned the photo, "Maxwell is crazy beautiful" along with the accompanying snapshot.

The blonde cutie looks just like her mother, posed on the floor in her Aden + Anais blanket. Because when you're a celebrity toddler, even your blankets are designer.

Anyone hoping for a picture of baby boy Ace Knute Johnson will just have to wait a little longer. The new addition, who was born on June 30, has yet to make his public debut -- probably so Simpson can get back in shape and make good on her Weight Watcher's deal.

Maxwell's first photos were reportedly sold for $800,000. No telling how much Ace will fetch in the open market.